When you get the chance to present a security solution to a customer, having a choice of good, better and best solutions is optimal. By having mounted working samples of each lock choice, the customer can make an informed decision.
Surveying any job requires time, attention to detail and detailed notes. It's easy today with camera phones and digital media to record each door in a survey and make notes as to measurements, lock type, local power sources, etc.
As mentioned earlier, always be sure you are always operating within the rules, regulations, laws and codes of the job location. Be aware that some cities in a larger municipal area may have codes that are stronger or weaker than an adjoining city. The AHJ is the answer man.